(2009?Putuo District Model) Density meter is made by using the principle of ______. Xiaoming used a bamboo chopstick and a piece of lead wire to make a simple density meter.

The design of the density meter makes use of the floating and sinking conditions of the object, so that the density meter floats in the liquid, according to the floating and sinking conditions of the object can be seen, floating F float = G thing, the object's gravity is unchanged, the buoyancy will be unchanged;

According to Archimedes' principle of F float = ρ liquid gV row can be seen, the greater the density of the liquid, density meter discharged the volume of the liquid will be smaller, so the following scale for the density of the above scale for the density is greater than the density, so liquid A is a liquid. The density of the scale below is greater than the density of the scale above, so the density of liquid A is the smallest.

The answer is: the object floating and sinking conditions; a..

The answer is: the object floating and sinking conditions; A.